Quote:
Originally Posted by HealeyRick
From the Mobil website (Delvac and Turbod Diesel are the same according to the site):
Question:
Mobil 1 vs. Mobil Delvac 1® for a Gasoline Engine . . .
Answer:
Mobil 1 formulas will deliver everything you need for your gasoline engine. In fact, during development, tests are run in both gasoline and diesel engines to demonstrate the superior performance of Mobil 1.
Mobil Delvac 1, which is designed for heavy-duty diesels, meets most diesel engine oil specifications, and also meets API SL certification. And because Delvac 1 operates in a different environment – diesel engines run longer, generate soot and run hotter, it contains different types and amounts of additives than Mobil 1. Even so, Delvac 1 still meets API SL certification for gasoline engines, and because of its high performance, we would expect it to do a good job of protecting your gasoline engine.
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API SL vs. API SM
API SM came out about November 2004. The "improvement" over API SL was based on emissions at the expense of engine wear. Under new API SM, some crucial engine wear additives are limited to about 2/3rds of what they were in API SL. Camshaft manufacturers were the first ones to notice the adverse effect of API SM on the wear of their products........
Mobil 1 0W40 has begun to lose a lot of fans, and most knowledgeable Porsche owners won't use it anymore.
One of the oils of choice recommended for oil/air cooled 911's is the Turbo Diesel 5W40. The additive levels of that oil (Which in addition to the diesel ratings, is rated SL for use in gasoline engines) are the closest approximation to what was available for our cars even 8 months ago.
Note that I am still using Mobil 1, so this is certainly not a "my brand is better than your brand" debate. It's more of a - "the government picked emissions over performance and I'm picking performance over emissions" comment.